// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/public/browser/web_contents_delegate.h"

#include <memory>

#include "base/compiler_specific.h"
#include "base/message_loop/message_loop.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/test/test_browser_context.h"
#include "content/test/test_render_view_host.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace content {

class MockWebContentsDelegate : public WebContentsDelegate {
};

class WebContentsDelegateTest : public RenderViewHostImplTestHarness {
};

TEST_F(WebContentsDelegateTest, UnregisterInDestructor)
{
    std::unique_ptr<WebContentsImpl> contents_a(static_cast<WebContentsImpl*>(
        WebContents::Create(WebContents::CreateParams(browser_context()))));
    std::unique_ptr<WebContentsImpl> contents_b(static_cast<WebContentsImpl*>(
        WebContents::Create(WebContents::CreateParams(browser_context()))));
    EXPECT_EQ(NULL, contents_a->GetDelegate());
    EXPECT_EQ(NULL, contents_b->GetDelegate());

    std::unique_ptr<MockWebContentsDelegate> delegate(
        new MockWebContentsDelegate());

    // Setting a delegate should work correctly.
    contents_a->SetDelegate(delegate.get());
    EXPECT_EQ(delegate.get(), contents_a->GetDelegate());
    EXPECT_TRUE(contents_b->GetDelegate() == NULL);

    // A delegate can be a delegate to multiple WebContentsImpl.
    contents_b->SetDelegate(delegate.get());
    EXPECT_EQ(delegate.get(), contents_a->GetDelegate());
    EXPECT_EQ(delegate.get(), contents_b->GetDelegate());

    // Setting the same delegate multiple times should work correctly.
    contents_b->SetDelegate(delegate.get());
    EXPECT_EQ(delegate.get(), contents_a->GetDelegate());
    EXPECT_EQ(delegate.get(), contents_b->GetDelegate());

    // Setting delegate to NULL should work correctly.
    contents_b->SetDelegate(NULL);
    EXPECT_EQ(delegate.get(), contents_a->GetDelegate());
    EXPECT_TRUE(contents_b->GetDelegate() == NULL);

    // Destroying the delegate while it is still the delegate for a
    // WebContentsImpl should unregister it.
    contents_b->SetDelegate(delegate.get());
    EXPECT_EQ(delegate.get(), contents_a->GetDelegate());
    EXPECT_EQ(delegate.get(), contents_b->GetDelegate());
    delegate.reset(NULL);
    EXPECT_TRUE(contents_a->GetDelegate() == NULL);
    EXPECT_TRUE(contents_b->GetDelegate() == NULL);

    // Destroy the WebContentses and run the message loop to prevent leaks.
    contents_a.reset();
    contents_b.reset();
}

} // namespace content
